In the beginning of nineties a group of pharmaceutical chemists working at Pfizer was developing prescription medications for treating hypertension and some cardiovascular diseases. Clinical trails suggested that the active element Sildenafil has little effect on angina pectoris but could induce marked penile erections. Some patients even refused to give back remaining drugs, and one of them even broke into the laboratory in order to claim more pills for further use. Pfizer therefore became aware of that they have invented potentially very popular medications. That’s how viagra pill came out.

Not only men over fifty are subject to trouble of potency, but also quite younger men. In average, around 3% of men aged from 20 to 40 years, 15-20% of men aged from 40 to 60 and 30% of men over 70 years have troubles of potency. Regardless of the age, troubles of potency are not normal, since have regular and active sexual life is the inherent of man at any age.